9/22/2009 9:35:06 AM

Kinematic or Dynamic: Which Viscosity Method Should You Use?

Ken Henderson

Ken Henderson Interview

The viscosity world has practitioners that use two different approaches for measuring fluid flow behavior. Kinematic viscosity utilizes capillary viscometers with gravity as the driving force to obtain fluid flow through a tube with defined diameter. Rotational viscometers impart a velocity to the fluid, ideally at a defined shear rate.

The petroleum world embraces the use of both instruments, but differentiates between when and why each are used. Ken Henderson, Chairman of the the ASTM D2 Committee on Fuels and Lubricants, will provide perspective on the benefits and disadvantages of each. In addition, he will explore the issue of bulk viscosity vs thin film measurement as it pertains to engines lubricants.

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